Form tie for wall structures



FORM TIE FOR WALL STRUCTURES Filed Feb. 21, 1931 jwwzz? By Kg; flZZ Wforms of wood which are removed when the Patented Mar. 22, 1932 UNITEDSTATES PATENT OFFICE LYDIA LAMPERT, OF CHICAGO, ILLINOIS, ASSIGNOR TOUNIVERSAL FORM CLAMP 00., OF CHICAGO, ILLINOIS, A GORPORATIONOF ILLINOISFORM TIE FOB WALL STRUCTURES Application filed February 21, 1981. SerialNo. 517,515.

This invention relates to form clamps for use in the construction ofconcrete walls such as piers, abutments, retaining walls and similar.structures.

Concerte walls are usually constructed in concrete is sufficiently setto be self-sustaining. These walls are often built to a considerableheight or vertical depth and 1t,

therefore, becomes necessary to hold the embedded tie rod after theconcrete has set.

The couplings are usually tapered and are threaded to the ends of thetie rod. In constructions heretofore in use, the couplings have alsobeen threaded to the end bolts.

With prior forms of ties, considerable difficulty has been experiencedin removing the couplings after the concrete has set because theconcrete, while hardening, exerts a great deal of pressure on thecouplings and tends to bind them to the tie rod. It is, therefore,desirable to slightly loosen the coupling from the concrete by partiallyunscrewing it before the concrete has completely set and before theforms are removed. This has not been possible with form ties heretoforein use because the couplings were threaded to the end bolts and thecouplings could not be loosened without removing the forms.

The main objects of this invention are to provide a form tie having animproved form of coupling; to provide an improved form or" end bolt forattachment to the coupling; to provide improved means for detachablyconnecting the end bolt to the coupling without the use of threads; toprovide means of this kind which will permit adjustment of the end boltwhereby the form tie may be expanded and contracted to accommodate formsof different sizes; and to provide a form tie of this kind wherein thecouplings may be slightly loosened from the concrete before removal ofthe forms. 1

D An illustrative embodiment of this inventron is shown in theaccompanying drawings, wherein Figure 1 is a vertical transverse sectionof aconcrete wall, showing part of a form and one of the improved ties.

Fig. 2 is anouter end view of one of the improved couplings.

Fig. 3 is an axial section of the coupling, taken on the line 33 of Fig.2, and showing also the ends of the bolt and tie rod which cooperatetherewith.

Fig. 4 is a view similar to Fig. 3 but taken on the line 4-4 of Fig. 2.

Fig. 5 is a transverse section of the coupling, taken on the line 55 ofFig. 4-

Figs. 6, 7 and 8 are sectional details showing three difierent forms ofclamps for use on the outer ends of the end bolts.

In the construction shown, the improved form tie is applied to thecustomary type of wall form comprising side members 1, studs 2 andbattens 3.

In the form shown, each of the improved ties comprises an intermediatetie rod 4 and a pair of end bolts 5 alined axially and detachablysecured together by coupling nuts 6.

The tie rod 4 is shorter than the distance between the form sides 1 andthe ends of the rod are threaded for engagement with the nuts 6. Thisconstruction permits the nuts to be readily adjusted relative to the tierod and to each other.

The outer ends of the bolts 5 may be provided with any one of variousclamps to secure the form against spreading. In the con-- structionshown in Figs. 1 and 6, the bolts 5 are provided with slots 7 forreceiving wedges 8, which are adapted to engage the outer faces of thebattens 3. Heads 9 are also formed 7 bolt {5V is provided with aclamping collar 12v havin a set screw 13 for locking the collar to theIt.

Mounted on the inner end of each of the bolts 5, is a key 14 forming onepart of the ba onet joint which detachably and adjust- .ab secures thebolt to the coupling.

e coupling nuts 6 are preferably tapered so as to facilitate theirremoval from the concrete. At one end of each coupling nut, is athreaded bore 15 for receiving the tie rod 4 and at the other end ofeach nut is a counter bore 16 for receiving one of the end bolts 5.

Formed in the counter bore 16, is a plurality of bayonet grooves 17spaced apart axially and separated from one another b annular ridges 18.The ridges 18 are provided with axiall alined notches 19 to permit thekey 14 to shifted into any one of the grooves 17 by the axial movementof the bolt 5 relative to the coupling nut. The key 14 is shifted intolocking engagement with any one of the ridges 18 by a partial rotationof the bolt 5 relative to the coupling. Extending axially through theridges 18, is a pin 20 forming a stop adapted to engage the key 14 tolimit the rotation of the bolt 5 relative to the coupling.

In operation, the rod 4 and end bolts 5 are supported on the form in themanner illustrated in Fig. 1. and the coupling nuts are adjusted so thatthe form sides 1 will be spaced the required distance from each other.An initial rough adjustment of the end bolts 5 may be obtained by meansof the bayonet joints. After the keys 14 have been shifted into thedesired bayonet grooves, the outer ends of the bolts 5 are secured tothe battens by any one of the clamps shown in Figs. 6, 7 and 8.

Before the concrete has completely set, a wrench may be applied to theouter ends of the bolts 5 for partially turning the coupling nuts so asto slightly loosen them from the concrete. This may be accomplishedwithout removing or shifting any of the form parts. After the couplingnuts have been slightly loosened, the parts are all left in place untilthe concrete has thoroughly set.

To dismantle the form, the end clamps are first removed from the bolts 5and the form members 3, 2 and 1 may then be removed. The coupling nutsmay then be removed from the concrete and from the tie rod 4 by rotatingthe bolts 5. After the coupling nuts are removed, the holes in the facesof the concrete are patched so as to present smooth surfaces.

Although but one specific embodiment. of this invention has been hereinshown and described, it will be understood that numerous details of theconstruction shown may be altered or omitted without departing from thespirit of this invention as defined by the following claims.

I claim:

1. A form tie comprising a tie rod and an end bolt alined axially, formclamping means on the outer end of said tie rod, a wed e seated in theouter end of said bolt, a con 1n nut for detachably securing the inneren s 0 said rod and bolt together, said nut having an axial bore, oneend of said bore being threaded for engagement with said tie rod, theother end of said bore having a plurality of ridges spaced apart axiallyand provided with notches, a key on the inner end of said bolt adaptedto be passed through said notches by the axial movement of said bolt andto be shifted into locking engagement with either of said ridges by apartial rotation of said bolt relative to said nut, and a shoulder insaid bore adapted to engage said key to limit the rotation of said boltrelative to said nut.

vided with notches, a key on the inner end of said bolt adapted to bepassed through said notches by the axial movement of said bolt and to beshifted into locking engagement with either of said ridges by a partialrotation of said bolt relative to said nut, and a pin extending axiallythrough said ridges to form a stop for engaging said key so as to limitthe rotation of said bolt relative to said nut.

Signed at Chicago this 19th'day of February, 1931.

LYDIA LAMPERT.

2. A form tie comprising a tie rod and an 5 v

